Let us explain if you are already not familiar with these features. Verbose boot will show everything thats happening while the device boots up.It shows a little low level information happening while booting. On the other hand, custom boot logo is what displays a graphical logo which is by default a white Apple.

The version of Greenpois0n which we are using currently uses GeoHot’s bootrom exploit. The exploit uses injection vector to apply kernel patches to get root access. In the current version Verbose and custom boot logos were not possible because the bootchain was actually not touched. Both verbose and custom bootlogos reuiore a patched iBoot which you do not have doing a userland jailbreak.